I am going to solve Richards equation for unsaturated zone using finite difference method. I read in several papers that van Genuchten method is used to estimate hydraulic properties. In van Genuchten formula we can estimate theta and K. what is the difference between the theta obtained by van Genuchten formula and the theta obtained by Richards equation. The other question is that in solving Richards equation we assume an initial h. in the next step h should be estimated so that we can calculate using this equation. How it can be updated in each step.
I would recommend the method presented in the paper
Casulli, Vincenzo, and Paola Zanolli. "A nested Newton-type algorithm for finite volume methods solving Richards' equation in mixed form." SIAM Journal on Scientific Computing 32.4 (2010): 2255-2273.
Here you find this book ""A nested Newton-type algorithm for finite volume methods solving Richards' equation in mixed form""
Dear friends
Thanks a lot for your valuable comments. do you have any matlab or fortran codes to solve 3d richards equation in unsaturated area. I have downloaded some codes from internet. but they solve 1D richards equation.
Shahriar Shahrokhabadi y Zoubair Boulahia , Vahid Moosavi necesito una ayuda en mi simulación por "Simulink" la ecuación de richards ,
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